Sahih al-Bukhari 1130
Book 19: Prayer at Night (Tahajjud) · Hadith 10
Hadith text
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا مِسْعَرٌ، عَنْ زِيَادٍ، قَالَ سَمِعْتُ الْمُغِيرَةَ ـ رضى الله عنه ـ يَقُولُ إِنْ كَانَ النَّبِيُّ صلى الله عليه وسلم لَيَقُومُ لِيُصَلِّيَ حَتَّى تَرِمُ قَدَمَاهُ أَوْ سَاقَاهُ، فَيُقَالُ لَهُ فَيَقُولُ " أَفَلاَ أَكُونُ عَبْدًا شَكُورًا ".
Narrated Al-Mughira:The Prophet (ﷺ) used to stand (in the prayer) or pray till both his feet or legs swelled. He was asked why (he offered such an unbearable prayer) and he said, "Should I not be a thankful slave?
Al-Mughira (رضی اللہ عنہ) bataate hain: Nabi (namaz mein) itna khade rehte ke unke donon paon ya pindliyan soojh jaatin. Poocha gaya kyun (Aap itni mushkil namaz padhte hain), Aap ne farmaya: "Kya main shukr-guzaar banda na banoon?"
Sahih al-Bukhari 1130 · Book 19, Hadith 10